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From "Eric Newton (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-509) default walog copy/sort uses replication of 1
Date Tue, 03 Apr 2012 12:34:23 GMT
default walog copy/sort uses replication of 1
---------------------------------------------

                 Key: ACCUMULO-509
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-509
             Project: Accumulo
          Issue Type: Bug
          Components: logger
         Environment: medium size cluster
            Reporter: Eric Newton
            Assignee: Eric Newton
            Priority: Trivial
             Fix For: 1.4.1


During recovery, the logger copied/sorted a recovery walog to hdfs.  The copy was ok, but
there was a checksum error when replaying the data.  The system did not recover without manual
intervention.  The work-around was to find the datanode serving the back block, and stop it.
 Then I removed the bad recovery file and restarted the master.  The copy/sort took place
again, and used a different datanode.  Recovery proceeded successfully.

We need to use a higher replication and/or a more sophisticated approach to verifying and
restarting recoveries.

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